220 7324 article Path: news.gmane.org!not-for-mail From: Jeremiah Willcock Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Setting calling convention separately from rest of linkage Date: Wed, 16 Oct 2013 14:13:11 -0400 (EDT) Lines: 24 Approved: news@gmane.org Message-ID: Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: TEXT/PLAIN; format=flowed; charset=ISO-8859-1 X-Trace: ger.gmane.org 1381947192 26424 80.91.229.3 (16 Oct 2013 18:13:12 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 16 Oct 2013 18:13:12 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBAABBN5O7OJAKGQEPTXZXWY@isocpp.org Wed Oct 16 20:13:15 2013 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-pd0-f197.google.com ([209.85.192.197]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1VWVas-0007lC-1o for gclcip-std-proposals@m.gmane.org; Wed, 16 Oct 2013 20:13:14 +0200 Original-Received: by mail-pd0-f197.google.com with SMTP id w10sf1775656pde.8 for ; Wed, 16 Oct 2013 11:13:12 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=date:from:to:subject:message-id:user-agent:mime-version :x-original-sender:x-original-authentication-results:reply-to :precedence:mailing-list:list-id:list-post:list-help:list-archive :list-subscribe:list-unsubscribe:content-type; bh=DQGvpHRr5Jov/CjsXp4HNydVJHavIm5fFDiWQRGcG1E=; b=AnXp3hTSN4rnriZv9KgZFsXiJ2MaPPp1QtOjQ93m8/cbNSnGM/Jwv1Fbw5amNWy957 MVOccu/3s/5lzJsJJAT8t3sNykPIh5XgFtKRVtvtEVOIPs5mUtznldfae1lgVGUpO/Vf LVtqoODjDYy0fv9CYRVf2EDU2DcRUJqBCd5oRFzC+FYBms8ldh6/aY4KgIfaUhv+7YDJ GXDsPYsJMhkeawFaAIOPDm9Bis3LjwmibUPuYEhHeyYAJmTmWn5i1XsjDTBa29lblMda f80kTbWA0+VN1N8u/cXEIB6oHGEpk8C1QniDoZ3LcRzRLp/0XZ8fv+EVjTyHRt5245eZ og+Q== X-Received: by 10.66.26.5 with SMTP id h5mr1624718pag.1.1381947192821; Wed, 16 Oct 2013 11:13:12 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.49.74.35 with SMTP id q3ls617715qev.50.gmail; Wed, 16 Oct 2013 11:13:11 -0700 (PDT) X-Received: by 10.236.223.168 with SMTP id v38mr1677745yhp.86.1381947191792; Wed, 16 Oct 2013 11:13:11 -0700 (PDT) Original-Received: from hartman.uits.indiana.edu (hartman.uits.indiana.edu. [129.79.1.194]) by mx.google.com with ESMTP id f10si30078855yhd.377.1969.12.31.16.00.00; Wed, 16 Oct 2013 11:13:11 -0700 (PDT) Received-SPF: neutral (google.com: 129.79.1.194 is neither permitted nor denied by best guess record for domain of jewillco@crest.iu.edu) client-ip=129.79.1.194; X-IronPort-AV: E=Sophos;i="4.93,508,1378872000"; d="scan'208";a="80928373" Original-Received: from mssg-relay.indiana.edu ([129.79.1.73]) by irpt-internal-relay.indiana.edu with ESMTP; 16 Oct 2013 14:13:11 -0400 Original-Received: from hartman.uits.indiana.edu (hartman.uits.indiana.edu [129.79.1.194]) by mssg-relay.indiana.edu (8.14.7/8.14.4/IU Messaging Team) with ESMTP id r9GID50X029069 for ; Wed, 16 Oct 2013 14:13:11 -0400 X-IronPort-AV: E=Sophos;i="4.93,508,1378872000"; d="scan'208";a="80928371" Original-Received: from burns.uits.indiana.edu (HELO mail-relay.iu.edu) ([129.79.1.202]) by irpt-internal-relay.indiana.edu with ESMTP; 16 Oct 2013 14:13:11 -0400 Original-Received: from flowerpot.osl.iu.edu (flowerpot.osl.iu.edu [129.79.49.75]) (authenticated bits=0) by mail-relay.iu.edu (8.14.7/8.14.4/IU Messaging Team Submission) with ESMTP id r9GIDBJK013753 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Wed, 16 Oct 2013 14:13:11 -0400 X-X-Sender: jewillco@flowerpot.osl.iu.edu User-Agent: Alpine 2.03 (LRH 1266 2009-07-14) X-Original-Sender: jewillco@crest.iu.edu X-Original-Authentication-Results: mx.google.com; spf=neutral (google.com: 129.79.1.194 is neither permitted nor denied by best guess record for domain of jewillco@crest.iu.edu) smtp.mail=jewillco@crest.iu.edu Precedence: list Mailing-list: list std-proposals@isocpp.org; contact std-proposals+owners@isocpp.org List-ID: X-Google-Group-Id: 399137483710 List-Post: , List-Help: , List-Archive: List-Subscribe: , List-Unsubscribe: , Xref: news.gmane.org gmane.comp.lang.c++.isocpp.proposals:7324 Archived-At: There does not appear to currently be a way to have a function with internal linkage but C calling convention: extern "C" uses external linkage, while "static" uses the C++ calling convention. The particular issue where this matters is in passing function pointers to C code. For example, there is no Standard-allowed way to pass an instance of a function template as a C function pointer without an extra layer of non-template wrapping. Would it make sense to have a construct that sets the calling convention but uses internal linkage, or a mechanism that only sets the calling convention without affecting linkage at all (to allow the kind of linkage used for template instances)? Because it would not affect name mangling, it could be applied to function templates as well, plus the names of these functions would not need to be unique across namespaces as with extern "C". -- Jeremiah Willcock -- --- You received this message because you are subscribed to the Google Groups "ISO C++ Standard - Future Proposals" group. To unsubscribe from this group and stop receiving emails from it, send an email to std-proposals+unsubscribe@isocpp.org. 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